Herb Lehr and Harry Daghlian transporting the plutonium core before the Trinity Test

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Transportation of plutonium charge for the first atomic bomb (experiment "Trinity") From Wikipedia: "Assembly of the nuclear capsule began on July 13 at the McDonald Ranch House, where the master bedroom had been turned into a clean room The polonium-beryllium." Urchin "initiator was assembled, and Louis Slotin placed it inside the two hemispheres of the plutonium core. Cyril Smith then placed the core in the uranium tamper plug, or" slug". Air gaps were filled with 0.013 mm gold foil, and the two halves of the plug were held together with uranium washers and screws which fit smoothly into the domed ends of the plug the completed capsule was then driven to the base of the tower -